First responders and Dartmouth Hitchock Medical Center staff help a patient onto an evacuating bus during an active shooter incident on Tuesday, Sept. 12, 2017, at the medical center in Lebanon, N.H. A family member shot and killed a 70-year-old female patient in the Intensive Care Unit earlier in the afternoon. (Charles Hatcher/The Valley News via AP)
First responders and Dartmouth Hitchock Medical Center staff help a patient onto an evacuating bus during an active shooter incident on Tuesday, Sept. 12, 2017, at the medical center in Lebanon, N.H. A family member shot and killed a 70-year-old female patient in the Intensive Care Unit earlier in the afternoon. (Charles Hatcher/The Valley News via AP) Credit: Charles Hatcher

NORTH HAVERHILL, N.H. — A man charged with killing his 70-year-old mother in her room at a hospital intensive care unit had asked his stepfather to leave so they could be alone and then aimed a gun at her and fired several times, according to a police complaint released Wednesday.

Travis Frink, of Warwick, Rhode Island, pleaded not guilty to a first-degree murder charge in the death of his mother, Pamela Ferriere. He was being held without bail.

Ferriere, of Groton, was fatally shot Tuesday at Dartmouth-Hitchcock Medical Center in Lebanon, where she was being treated for an aneurysm. She was expected to be released Friday.

Frink, 48, was handcuffed and said nothing during the brief arraignment Wednesday in Grafton Superior Court in North Haverhill.

Prosecutor Jane Young asked that Frink have no contact with his stepfather, Bob Ferriere, who told police he saw Frink shoot her. Defense lawyer Rebecca McKinnon agreed to the request. She declined to comment afterward.

A police affidavit says Frink told officers he went to the hospital to kill his mother. No reason or motive was given.

“Who shoots their mother? Who does that?” said Patti Oakley, a neighbor of the Ferrieres’. She said her heart broke when she heard the news.

The town of Groton put out a statement saying Pamela Ferriere was active in town government and in her local church, and she enjoyed gardening and biking with her husband. Oakley said she loved to bake Halloween cookies for children.

When Frink went to visit her Tuesday, Bob Ferriere was in the room and Frink asked to spend some time alone with his mother, authorities said.

Ferriere asked his wife if that was OK and she indicated yes, the affidavit said. As he was leaving the room, he heard her shout or scream, then turned and saw Frink pointing a gun at her, the affidavit said. After several shots were fired, Frink walked out of the room without saying anything, Ferriere told police.

Pamela Ferriere’s nurse called 911, saying a visitor had pulled out a black handgun. When she saw the gun, the nurse ran and took shelter in a different room. She then heard two gunshots, followed by screams.

The hospital, New Hampshire’s largest, was then placed on lockdown.

When asked about the shooting Wednesday morning by The Associated Press, Bob Ferriere said he had no idea why it happened. “I’m not a mind reader,” he said, before hanging up.

Frink was detained as he tried to leave the grounds of Dartmouth-Hitchcock, authorities said. The affidavit said Frink also visited his mother earlier in her hospital stay. The nurse who called 911 told police she had been his mother’s nurse for the past two weeks.

In 2013, Frink’s ex-wife and her 3-year-old son were found dead inside a running car at an apartment complex in Rhode Island.

Police said that when officers opened the door of the running car with fogged windows, they found the inside of the vehicle very hot and smelling of alcohol and vomit. Officials said the body of Kathleen Frink was found in the driver’s seat and the body of her son was found on the floor in the back of the car.

Police said at the time they ruled out foul play and suspected alcohol played in a role.